Corrosion of polypyrrole: Kinetics of chemical and electrochemical processes in NaOH solutions. (April 2017)

• Record Type: Journal Article
• Authors: Wang, Yao; Qiu, Yubing; Chen, Zhenyu; Guo, Xingpeng
• Is Part Of: Corrosion science. Volume 118(2017)
• Page Start: 96
• Page End: 108
• Publication Date: 2017-04
• Subjects: A. Polymer -- B. Cyclic voltammetry -- B. SEM -- B. XPS -- C. Kinetic parameters; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2017.01.023
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Chemical and electrochemical corrosion kinetics of PPy in NaOH are identified. Two corrosion stages are proved to follow first-order kinetics in PPy corrosion. Dissolved oxygen and concentrations of NaOH play key roles in PPy corrosion. Chemical and electrochemical processes are mutually promoted in PPy corrosion. Abstract: The corrosion kinetics of PPy/SO4 in aerated and de-aerated NaOH solutions (0.02–0.5 M) were investigated and the interaction between chemical and electrochemical corrosion processes was verified. The corrosion of PPy is mainly caused by the chemical attack of OH − in de-aerated NaOH, but is accelerated largely in aerated NaOH for the occurrence of the electrochemical processes. These two processes are mutually promoted in aerated NaOH. At a constant NaOH concentration ( C NaOH ), two corrosion stages are proved to follow first-order kinetics. In each corrosion stage, the chemical and electrochemical processes have different kinetic behavior and C NaOH has important influence on them.